I found this page from AQS with a link to her method, but it stated it was a quick 4 FG , not 45. One has to be a paid subscriber to their site to access the page so I will not be bothering. Here's the link if anyone is a subscriber and wants to look. Just read a bit to find it
http://www.aqsblog.com/river-tree-the-quilt
p.s. perhaps 4.5" was meant.